Small granules on the underside of the coronal area in men may be due to the presence of penile pearly papules, and may also be due to inflammatory stimuli as well as sexually transmitted diseases and other factors. 1. Penile pearly papules: may be associated with factors such as excessively long foreskin and poor personal hygiene, which can cause small granules of skin color to appear in the area of the coronal groove, without any conscious symptoms, and do not require special treatment. 2. Inflammatory stimulation: men do not pay attention to the coronary groove area cleaning, circumcision and other secretions or pathogen infection on the local stimulation, will make the local appearance of small particles, may also be accompanied by itching, pain, or even broken bleeding. 3. Sexually transmitted diseases: for example, condyloma acuminatum, mostly caused by unclean sex, can make the coronary groove part of the appearance of some small particles, accompanied by mild itching as well as pain, the area can be gradually increased, and has a certain degree of contagious. The male crown under the small particles, and accompanied by obvious discomfort symptoms, should be vigilant for disease factors, it is recommended that the doctor for examination and treatment.